{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84379","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-09-01T16:27:58.130Z","datePublished":"2026-09-02T17:57:17.092Z","dateUpdated":"2026-09-02T18:20:46.599Z"},"containers":{"cna":{"title":"HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers","problemTypes":[{"descriptions":[{"cweId":"CWE-93","lang":"en","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"},{"name":"https://github.com/pydantic/httpx2/pull/1142","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/pull/1142"},{"name":"https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d"},{"name":"https://github.com/pydantic/httpx2/releases/tag/v2.11.0","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/releases/tag/v2.11.0"}],"affected":[{"vendor":"pydantic","product":"httpx2","versions":[{"version":"< 2.11.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-02T17:57:17.092Z"},"descriptions":[{"lang":"en","value":"HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0."}],"source":{"advisory":"GHSA-h4x7-gw46-3wm6","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T18:20:04.628894Z","id":"CVE-2026-84379","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-02T18:20:46.599Z"}}]}}